Reach M+ on usb port of Raspberry Pi 4

With the last firmware, I got some issue to get nmea messages on the usb port of the raspberry (/dev/ttyACM0 by default) with the usb-to-pc configuration (38400 baud)
Is there some configuration to add to the raspberry other than the usual (add user to dialout, etc …) ?
Is there a start time to wait before reading the port ?

Edit: I confirm the nmea publishing on tcp server

My mistake : ardurover was using the port so I couldn’t display it with screen command

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